A comparison of the sintering characteristics of ball-milled and attritor-milled W-Ni-Fe heavy alloy


Ovecoglu M. L. , OZKAL B. , SURYANARAYANA C.

JOURNAL OF MATERIALS RESEARCH, cilt.11, ss.1673-1682, 1996 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 11 Konu: 7
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1557/jmr.1996.0210
  • Dergi Adı: JOURNAL OF MATERIALS RESEARCH
  • Sayfa Sayıları: ss.1673-1682

Özet

Blended elemental W-7 wt. %Ni-3 wt. %Fe powders were mechanically alloyed in a planetary ball mill and a heavy duty attritor. The structural and morphological characteristics of the as-milled powders were characterized by x-ray diffraction and electron microscopy techniques. A ternary solid solution of Fe and Ni in W formed in both the cases; the amount of Ni and Fe dissolved is higher in the attritor-milled powder than in the ball-milled powder. Morphologically, the W-rich particles in the attritor-milled powders were spheroidal, smaller in size, and showed a narrower size distribution than in the ball-milled condition. These differences led to increased density in the attritor-milled powder compact and significant differences in chemical composition of the matrix region and W-rich grains. Transmission electron microscopy investigations of the matrix region in the compacts revealed the presence of Fe2W precipitates uniformly distributed in an Ni(Fe, W) matrix.